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Table 1 Redox potentials of commonly used oxidants indicating their reactivity

From: Advanced oxidation processes for the removal of cyanobacterial toxins from drinking water

Oxidant pH range Redox potential in V/SHE
Sulfate radical (SO−∙4 ) Acidic to neutral 2.5–3.1a
Hydroxyl radical (∙OH) Acidic 2.7a
Neutral to alkaline 1.8a
Ferrate ([FeO4]2−) Acidic 2.2b
Alkaline 0.7b
Ozone (O3) Acidic 2.1a
Alkaline 1.2a
Peroxydisulfate (S2O82−) Acidic 2.0a
Hydrogen peroxide (H2O2) Acidic 1.8a
Alkaline 0.9a
Peroxymonosulfate (HSO5 or SO52−, pKa = 9.4c) Acidic 1.8a
Hydroperoxy radical (HO2∙) 1.7d
Permanganate (MnO4) Acidic 1.7a
Alkaline 0.6a
Hypochlorous acid (HOCl) 1.5c
Chlorine (Cl2) 1.4d
Chlorine dioxide (ClO2) 1.3d
Peroxymonosulfate radical (SO5∙) Neutral 1.1c
Sulfite radical (SO3∙) Neutral 0.6c
  1. SHE standard hydrogen electrode
  2. a[35]
  3. b[10]
  4. c[36]
  5. d[13]